numbers = {
    "zero": 0,
    "one": 1,
    "two": 2,
    "three": 3,
    "four": 4,
    "five": 5,
    "six": 6,
    "seven": 7,
    "eight": 8,
    "nine": 9
}
usual_numbers = [101, 103, 107, 109, 113, 127, 131, 137, 139, 149, 151, 157, 163, 167, 173, 179, 181, 191, 193, 197,
                 199, 211, 223, 227, 229, 233, 239, 241, 251, 257, 263, 269, 271, 277, 281, 283, 293, 307, 311, 313,
                 317, 331, 337, 347, 349, 353, 359, 367, 373, 379, 383, 389, 397, 401, 409, 419, 421, 431, 433, 439,
                 443, 449, 457, 461, 463, 467, 479, 487, 491, 499, 503, 509, 521, 523, 541, 547, 557, 563, 569, 571,
                 577, 587, 593, 599, 601, 607, 613, 617, 619, 631, 641, 643, 647, 653, 659, 661, 673, 677, 683, 691,
                 701, 709, 719, 727, 733, 739, 743, 751, 757, 761, 769, 773, 787, 797, 809, 811, 821, 823, 827, 829,
                 839, 853, 857, 859, 863, 877, 881, 883, 887, 907, 911, 919, 929, 937, 941, 947, 953, 967, 971, 977,
                 983, 991, 997]
ten = 0
sot = 0
numbers_lines = input().split()
if numbers_lines[0] in numbers and numbers_lines[0] != "zero" and numbers_lines[1] in numbers and numbers_lines[2] in \
        numbers and len(numbers_lines) == 3:
    end_numbers_lines = int(str(numbers[numbers_lines[0]]) + str(numbers[numbers_lines[1]]) + \
                        str(numbers[numbers_lines[2]]))
    end_number_plus = end_numbers_lines
    end_number_minus = end_numbers_lines
    if end_numbers_lines in usual_numbers:
        print(end_numbers_lines)
    else:
        while end_number_plus not in usual_numbers:
            end_number_plus += 1
            ten += 1
        while end_number_minus not in usual_numbers:
            end_number_minus += 1
            sot += 1
        if ten < sot:
            print(end_number_plus)
        else:
            print(end_number_minus)
else:
    print("Wrong input")
